painting vs graphic art

painting and graphic art both are nouns.

Word	Noun	Adjective	Verb	Adverb
painting	Yes	No	No	No
graphic art	Yes	No	No	No

As nouns, graphic art is a hypernym of painting; that is, graphic art is a word with a broader meaning than painting:

painting: graphic art consisting of an artistic composition made by applying paints to a surface
graphic art: the arts of drawing or painting or printmaking

painting (noun)	graphic art (noun)
creating a picture with paints	the arts of drawing or painting or printmaking
the occupation of a house painter
the act of applying paint to a surface
graphic art consisting of an artistic composition made by applying paints to a surface